33975A, 33975 Datasheet - Freescale Semiconductor

33975A - Multiple Switch Detection Interface

of each terminal can be found in the Functional Terminal Description section on page 11.

Terminal 1 2 3 4 5 *8 25 *28 9 *15, 18 *24 16 17 29 30 31 32 Terminal Name GND SI SCLK CS SPn SGn VPWR WAKE INT AMUX VDD SO Formal Name Ground SPI Slave In Serial Clock Chip Select Pr

www.DataSheet4U.com Freescale Semiconductor Technical Data Document order number: MC33975 Rev 4.0, 08/2005 Multiple Switch Detection Interface with Suppressed Wake-Up and 32mA Wetting Current Freescale offers multiple Switch Detection Interface Devices.

The 33975 Multiple Switch Detection Interface with Suppressed Wake-Up is designed to detect the closing and opening of up to 22 switch contacts.

The switch status, either open or closed, is transferred to the microprocessor unit (MCU) through

33975A Features

* a 22-to-1 analog multiplexer for reading inputs as analog. The 33975 device has two modes of operation, Normal and Sleep. Normal mode allows programming of the device and supplies switch contacts with pull-up or pull-down current as it monitors switch change of state. The Sleep mode provides low qui

33975_FreescaleSemiconductor.pdf